During a fight-or-flight response, a person can experience vasoconstriction in some blood vessels and vasodilation in others. How is it possible that norepinephrine can produce both vasodilation and vasoconstriction?
A) There are different membrane receptors for noepinephrine, and activation of different receptor types determines the response of the effector
B) There are different forms of norepinephrine which bind to the same receptors but have different effects on the cells
C) When norepinephrine flows through the membrane into smooth muscle cells, it can bind to different proteins causing different responses in different cells.
D) Norepinephrine can bind to G-protein receptors causing a signal cascade and cAMP can have various effects inside of the cytosol, depending on the type of cell that it is in.

Question

Quizplus · Accepted Answer

Different membrane receptors for norepinephrine exist, and activation of different receptor types determines the response of the effector. Some receptors cause vasoconstriction, while others cause vasodilation.

During a Fight-Or-Flight Response, a Person Can Experience Vasoconstriction in Some